reproduce (this is a W=1 build):
        git checkout 4701f33a10702d5fc577c32434eb62adde0a1ae1
        b4 shazam https://lore.kernel.org/r/20250325-unique-ref-v9-2-e91618c1de26@pm.me
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash rustfmtcheck